Water flowing out. Data flowing in.
A water system activation at the Thad Cochran Test Stand (B-2) on Jan. 30 at NASA’s Stennis Space Center near Bay St. Louis, Mississippi, helped capture critical data to support testing a new SLS (Space Launch System) stage expected to fly on the Artemis IV mission.
The activation milestone tested new cooling systems that were added for the future Green Run test series of NASA’s exploration upper stage (EUS). The more powerful upper stage is a four-engine liquid hydrogen/liquid oxygen in-space stage for the evolved Block 1B version of SLS.
For Green Run, teams at NASA Stennis will activate and test all systems to ensure the stage is ready to fly. It will culminate with a hot fire of the stage’s four RL10 engines, just as during an actual mission.
As part of the test stand modification, crews have added water-cooled diffusers to act as a heat shield to manage the super-hot exhaust from all four RL10 engines; water-cooled fairings to direct engine exhaust to align with the diffuser walls; and a purge ring that supplies cooling water and gaseous nitrogen to protect a flexible seal that allows the e …